Ordered two of these individual switch holders. The order was split and delivered with a difference of several days. What I received was an actual item and what appeared to be a three or four piece halter piece. The second is designed to snap onto another holder so it cannot be installed alone. The brackets appear to have been something that might help protect the back of the derailleur, mounted where dirt, water and rocks could be thrown onto the back. Since one of them wasn't used by itself I figured it would be best to cut the holes to the right size for the switches. A large hole can weaken the plate too much. If you want to mount three or four switches together, it may be better to cut out a big hole and use a three or four group holder. This can be easier than trying to precisely cut individual holes for multiple adjacent switches. For a switch, it was best to cut a smaller hole to fit the switch. I use a heated box cutter to cut holes for the switches. Carefully mark the hole. Cut off a small size, then cut a hole exactly along the lines and check that the switch is installed correctly.
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